Finding the Third Proportional to 647,040 and 1,405,858

Step by Step Solution

1. Step 1: Write the proportion equation
   647,040 : 1,405,858 = 1,405,858 : x
2. Step 2: Convert to fraction form
   647,040/1,405,858 = 1,405,858/x
3. Step 3: Cross multiply
   647,040x = 1,405,858 × 1,405,858
4. Step 4: Simplify right side
   647,040x = 1,976,436,716,164
5. Step 5: Solve for x
   x = 1,976,436,716,164/647,040
6. Step 6: Final answer
   x = 3,054,581.97